12 September 2006 Accurate colorimetric feedback for RGB LED clusters
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Abstract
We present an empirical model of LED emission spectra that is applicable to both InGaN and AlInGaP high-flux LEDs, and which accurately predicts their relative spectral power distributions over a wide range of LED junction temperatures. We further demonstrate with laboratory measurements that changes in LED spectral power distribution with temperature can be accurately predicted with first- or second-order equations. This provides the basis for a real-time colorimetric feedback system for RGB LED clusters that can maintain the chromaticity of white light at constant intensity to within ±0.003 Δuv over a range of 45 degrees Celsius, and to within 0.01 Δuv when dimmed over an intensity range of 10:1.
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Kwong Man, Kwong Man, Ian Ashdown, Ian Ashdown, } "Accurate colorimetric feedback for RGB LED clusters", Proc. SPIE 6337, Sixth International Conference on Solid State Lighting, 633702 (12 September 2006); doi: 10.1117/12.683239; https://doi.org/10.1117/12.683239
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